I was wondering what you thought about the Wiseco piston from the original MX400's ... it is the true 12.5:1 correct? I am looking around for one, I imagine the difference between that and the 11.5-11.8:1 of the 02's and 03's is probably worth a horsepower, and more is better. Also, what do you think a original Wiseco in the box w/rings etc is worth? I am following one on Ebay because I'd like to put my motor back together with it when I get the FDO head installed. Any and all opinions are appreciated. Thanks - Zack

 

Thats what I am doing.Have you seen the "Time to spill the beans" thread at CDLR?

 

Yeah, maybe I confused your intentions with that of Wistech. Ooopsy.. hehe. I first have to make sure the gapless ring set that comes with my FDO head will still work with the Wiseco, and second, I have to acquire a Wiseco. At the true 12.5:1 you think it is safe to run 93/94 octane? They claimed that 12.5 in the manuals and still that is what they recommended so I am assuming that we can get away with it. If not I'll run a mix and make like a 96 octane.

What do you think one of these Wiseco's is worth? Or other places to find one other than the loner on Ebay? Thanks again.

 

Hey Thomez , They are running the red powdercoat in two days and again in about 3 weeks so there should be no problem with turnaround.

I have no idea about the compression issue but I have never been a fan of over 12-1 . Fuel requirements for that high of compression ratio just became more trouble than it was worth to me.

 

My original motor was the 12.5-1 motor no problem running premium pumpgas but if you put any lower octane in it would definitly ping.You can get the pistons from R&S in stock or 450 bore they are also having extruded sleeves made.I believe Haydug and Winky are going together to get a batch of pistons made up also and they are going to use the Southbay castiron sleeve.

 

Hehe ... can you get that 450 in the 12.5:1 ? Now that would be the ticket! [img]i/expressions/face-icon-small-happy.gif[/img]

I'll have to give Kyle a call and see what the Wiseco pricing is. I think I'm going to move up as long as the gapless rings fit. I'll have to check with Haydug on that one.

Wistech - sweeet on the powdercoat I'll get the message to Jason and mine should be there for the 3 week from now date. I think he'll want to have his there then too. Oh crap, that is when we are supposed to be riding. Well ... I am fine without the stuff but I think he might need what he has to send on his bike to ride it. I'll let you know. Thanks again.

My guess is the castiron sleeves are the better than extruded ... correct?

Thanks again yall. Tryin to put together a beast here [img]i/expressions/face-icon-small-happy.gif[/img]

 

The castiron sleeve?I am not sure about that one.On one hand castiron is more stable but on the other lots of automotive engines had trouble with head gaskets when using aluminum heads on castiron blocks.Also all the modern atv and dirtbike motors use all aluminum with nikasil which hols up real well.I went with the extruded aluminum sleeve.Maybe Wistech could give his opinion on castiron/aluminum sleeve?

 

The problems with cast iron cyllinders with aluminum heads are that the rate of expansion is different and causes head gasket wear. Also cast iron doesnt conduct heat nearly as well as plated aluminum cyllinders(nickel silicon carbide) There can be a 50 to 100degree reduction in head temps from nikasil cyllinders. The only advantage I see with cast iron is cost and reborabilty. Nikasil cyllinders are very resistant to wear. 27 is right about head gasket failures with iron blocks and aluminum heads. Its not a question of if they head gasket will fail but when. Ive changed ten times as many head gaskets on aluminum headed engines as iron headed ones. Since quad engines dont run very many hours compared to autos I dont think its really a problem.

 

So far the aluminum sleeve sounds like a winner. When I get to the point of getting my crank done and maybe a Champion 450 I'll have to try and mate up a 12.5:1 piston with an aluminum sleeve - those and a balanced crank sound like the ticket.

 

Thomez, I think we are following the same piston on e-bay, I just recently purchased a cannondale and was looking at it for a back up. I'm new to the site and caught you mail and did not won't to run the price up on you. Let me know if you have to have it and I can back off.

Bunk